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Update section 17.3 (Trigonometry) of arith.txi Add text to help strings to indicate which functions use radians and which use degrees. Add cross-references to radian function descriptions.
author Rik <rdrider0-list@yahoo.com>
date Sun, 26 Apr 2009 22:19:57 -0700
parents eb63fbe60fab
children 16f53d29049f
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eb63fbe60fab update copyright notices
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1 ## Copyright (C) 1994, 1996, 1997, 1999, 2000, 2005, 2006, 2007, 2008
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2 ## John W. Eaton
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Mapping Function} {} csch (@var{x})
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22 ## Compute the hyperbolic cosecant of each element of @var{x}.
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23 ## @seealso{acsch}
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24 ## @end deftypefn
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26 ## Author: jwe
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27
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28 function w = csch (z)
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30 if (nargin != 1)
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31 print_usage ();
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32 endif
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33
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34 w = 1 ./ sinh(z);
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35
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36 endfunction
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37
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38 %!test
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39 %! x = [pi/2*i, 3*pi/2*i];
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40 %! v = [-i, i];
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41 %! assert(all (abs (csch (x) - v) < sqrt (eps)));
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43 %!error csch ();
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45 %!error csch (1, 2);
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